XTNETA1570MFP datasheet(19/68 Pages) TI1

19 / 68 page

TNETA1570

ATM SEGMENTATION AND REASSEMBLY DEVICE

WITH INTEGRATED 64BIT PCIHOST INTERFACE

SDNS033B − JUNE 1995 − REVISED MAY 1996

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

PRINCIPLES OF OPERATION

Host Interface

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Internal Registers and Counters

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Control-Memory Maps

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

Functional Overview

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Segmentation Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reassembly Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cell Interface

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

functional overview

The function of the TNETA1570 is centered around the entries in the TX DMA state table for segmentation and

the RX DMA state table for reassembly. The entries in the tables hold information regarding what type of data

to process, where to find it or store it, and the current status of the segmentation/reassembly process for the

entry.

For segmentation, the scheduler table is used to select the next entry in the TX DMA state table for processing.

For reassembly, the VPI and VCI fields of the incoming ATM cell are decoded using the VPI/VCI DMA pointer

table to locate the entry in the RX DMA state table for processing.

The data interface to the host is the 32-bit/64-bit PCI-bus interface. The interface to the ATM layer is the UTOPIA

interface.

functional block diagram

Segmentation

Control-

Memory

Interface

and

Arbitration

PCI Bus

Reassembly

PCI-Bus

Interface

Control Memory

Segmentation

Scheduler

Reassembly

Time Out

Reassembly

UTOPIA

Interface

JTAG

Reassembly

UTOPIA

Interface

UTOPIA Transmit

UTOPIA Receive

Payload Data

Other Data

The TNETA1570 can be configured to transmit and receive either AAL5 or transparent-AAL packets. The

segmentation and reassembly of AAL5 packets is performed in accordance with ITU-T specifications I.361 and

I.363 (11/93 update). The protocol used to segment and reassemble AAL5 packets is well specified in the ITU-T

documents. The protocols for segmenting and reassembling a transparent-AAL packet is not specified by any

known standards body; therefore, there is no official sanction for a transparent AAL and no interoperability

specification exists. However, a transparent AAL provides a convenient method for transporting proprietary

control and data information or data traffic that does not fit well in a currently defined AAL (i.e., voice/video

traffic).

NOTE: The terms transmit and segmentation are both used to describe the segmentation operation and the terms receive and reassemble are

both used to describe the reassembly operation in this document.

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